Machine for cutting curved strips.



T. BRADSHAW.

MACHINE FOR CUTTING CURVED STRIPS.

APPLICATION FILED mac. 1. 1914.

1,162,331. Patented Nov. 30, 1 915.

L J *IIIII Q 2 /y W- n l@q 13 1/11-x\ ;\\\\\wa\%*2\\ 14 q 1 5' INVENTOR,WITNESSES: I Thomas Bradshaw 2 iZW w BY 71%; M. 1,4 I ATTORNEY COLUMBIAPLANOGRAPH co.,wAsanga'roN. D. c.

THOMAS enansnaw, or EAST OAKLAND, cnnrromvm.

MACHINE FOR CUTTING CURVED STRIPS.

7 Specification of Letters Patent.

Application filed December 7, 1914. Serial No. 875,835.

To all whom it may concern Be it known that I, THOMAS BRADSHAW, acitizen of the United States, residing at East Oakland, in the county ofAlameda and State of California, have invented new and usefulImprovements in Machines for Cutting Curved Strips, of which thefollowing is a specification.

A. successful casing for pneumatic tires is made of narrow, ellipticalstrips of the material known as rubber belting, which consists of rubberin which canvas is embedded, said strips being arranged side by side atan angle of abeut 45 with the plane of the tire, and then vulcanized soas to make a continuous sheet.

The object of the present invention is to provide a machine for rapidlyand economically cutting said strips from a sheet of rubber belting.

In the accompanying drawing, Figure 1 is a. plan view of the machine;Fig. 2 is a longitudinal section of the same the cutter being omitted onthe line 2-2 of Fig. 1; Fig. 3 is an enlarged transverse section of thesame on the line 8-3 of Fig. 1; Fig. 41 is a broken transverse sectionshowing the cutter in a position different from that in Fig. 3; and Fig.5 is a detail plan view of a rubber strip cut by thev machine.

Referring to the drawing, 1 indicates a table supported upon legs 2.Secured to said tableis an extension 3 having bearings 4 for a drivingshaft 5 upon which is secured a bevel pinion 6 meshing with a bevel gear7 on a shaft 8 having a bearing 9 in said extension, and carrying aflanged head 10, to which is secured an oblique cylindrical cutter 11having a removable blade 12. Said cutter is secured to said head so thatits plane makes an angle at 45 with the axis of the head. The outer endof said shaft 8 rotates in a bearing 13 secured, as shown at 14, to thetable. The cutter rotates in an elliptical hole in a die plate 15resting in a recess in the table.

The rectangular sheet 16 of rubber belting is advanced bymeans of upperand lower rollers 17, 18, the table being formed with a transverse slot19 to receive the lower roller 18 to'enable it to press the sheet 16 ofrubber belting between said lower roller and the upper-roller 17, saidupper roller, rotating in boxes 21 vertically slidable in verticalguideways 22 and depressed by coiled springs 23, which in turn aredepressed by screws 24: screwed through said guideways. Each time thatthe cutter rotates in the hole in the die plate, it'cuts off asemi-elliptical strip, such as that shown at 25, from the advancing endof the rubber belting. In order to advance said rubber belting once foreach rotation of the cutter, there is secured upon the shaft 5 apinion26 which meshes with a. gear wheel 27 on a short shaft 28, on whichshaftis also carried a pinion 29 which meshes with a gear wheel 31 on a shortshaft 32 which also carries an eccentric 33 which engages a roller 34 onone end of a link 36. having a slot 37 around said shaft 32 andretracted by a spring 38 attached to a finger 39 on said link. The otherend of the link is pivotally connectedto an arm 41 loose on a. shaft 42at one end of the roller 17 on the end of which arm is a pawl 43 pressedby a spring 44 against a ratchet wheel 16 on said shaft. The diametersof the pinions 26, 29 and gear wheels 27. 31 are such that the link isreciproeated once with each revolution of the shaft 8. Thus, with eachrevolution of the shaft 8, the rubber belting is advanced apredetermined distance and a semi-elliptical strip of the desired widthis out 01f by the cutter 11.

I claim 2- 1. In combination with a table, a die plate thereon, a shaftarranged obliquely to the plane of the die plate, a cutting bladesecured to the shaft and having an arcuate edge, said cutterbeing soarranged relatively to the shaft that, in one position of its movementwith the shaft, it is substanti ally in the plane of the die plate, thearcuate edge of the cutter being then closely adjacent to the edge ofsaid plate.

2. In combination with a table, a die plate thereon, a shaft arrangedobliquely to the plane of the die plate, a cutting blade secured tothevshaft and having an arcuate edge, said cutter being so arranged rela-Patented Nov. so, 1915.

tively to the shaft that, in one position of In testimony whereof I havehereunto set its movement With the shaft, it is substanmy hand in thepresence of two subscribing tially in the plane of the die plate, thearcu- Witnesses.

ate edge of the cutter being then closely THOMAS BRADSHAWV. adjacent tothe edge of said plate, and means Witnesses:

for automatically advancing the material to FRANCIS M. WRIGHT,

be cut With each revolution of said shaft. G. M. BALL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0.

